Flexible Display Substrate Layout With Fewer Inorganic Insulators
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Solution Overview
Problem
Flexible display panels face poor bending performance due to inorganic insulative layers between transistors, which are not easily bendable, leading to structural limitations.
Innovation Solution
The use of a display substrate with a first active layer made of low-temperature polysilicon (LTPS) and a second active layer made of indium gallium zinc oxide (IGZO) semiconductor material, separated by an organic insulative layer with a first opening, allowing for improved flexibility and reduced stress between transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If at least two inorganic insulative layers are arranged between the active layer of the first transistor and the active layer of the second transistor, then the electrical insulation and stability are improved, but the bending performance and flexibility deteriorate
Solution Approach 1:
The patent removes one of the two inorganic insulative layers (specifically the second insulative layer) from the structure between the first and second transistors. This extraction reduces the total number of rigid layers, thereby improving bending performance while maintaining adequate electrical insulation through the remaining first insulative layer and direct contact structures.
Solution Approach 2:
The patent employs organic insulative layers (such as polyimide) as thin film structures that inherently possess flexibility and bendability. These organic layers replace portions of the rigid inorganic insulative layers, enabling the display substrate to bend smoothly without cracking or delaminating, thus significantly improving flexible display performance.
2Manufacturing precision
If multiple inorganic insulative layers are used to separate transistor active layers, then manufacturing precision and electrical isolation are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the functions of multiple separate insulative layers into a more integrated structure. Specifically, the first insulative layer serves multiple purposes including electrical insulation and structural support, while the removal of the second insulative layer simplifies the overall architecture. This merging reduces manufacturing steps and structural complexity while maintaining precision through optimized layer thicknesses and material selections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the bending performance of flexible display panels by reducing the number of inorganic insulative layers, ensuring stability of threshold voltage and low leakage current, while maintaining structural integrity during high-temperature annealing processes.
Implementation Method 1
a heat-resistant temperature of the first insulative layer is greater than 350° C.
Data Source
AI summary
Provided is a display substrate. The display substrate includes a base substrate which includes a first surface; a first transistor which includes a first active layer and a first gate insulative layer; a first insulative layer; and a second transistor which includes a second active layer and an orthographic projection of the second active layer on the first surface is staggered from an orthographic projection of the first active layer on the first surface.